KHOU reported that a federal and county official said there were multiple students killed and a wounded officer. The local news outlet also reported that multiple victims were taken to a Galveston hospital.

The shooter, believed to be a student, has reportedly been arrested. Witnesses said the shooter had a shotgun.

BREAKING: Assistant principal says shooter at Texas high school "has been arrested and secured," no comment on possible injuries.

The Santa Fe Independent School District’s statement on the shooting, per NPR:

This morning an incident occurred at the high school involving an active shooter. The situation is active, but has been contained. There have been confirmed injuries. Details will be released as we receive updated information. Law enforcement will continue to secure the building and initiate all emergency management protocols to release and move students to another location. All other campuses are operating under their regular schedules.

One student who was interviewed, Paige, said she heard “really loud booms” and “didn’t know what they were at first.”

Then she heard screaming.

Santa Fe High School student: "As soon as the alarms went off, everybody started running outside — and next thing you know…you hear 'boom, boom, boom.' And I just ran as fast as I could to the nearest forest, so I could hide and called my mom." https://t.co/RKzmCQIVNipic.twitter.com/eaNWF0uoDN